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Finding the Fourth Proportional to 1,387.84, 2,080.72 and 656.68

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Solution

The fourth proportional to 1,387.84, 2,080.72 and 656.68 is: 984.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,387.84 : 2,080.72 = 656.68 : x
  2. Step 2: Convert to fraction form
    1,387.84/2,080.72 = 656.68/x
  3. Step 3: Cross multiply
    1,387.84x = 2,080.72 × 656.68
  4. Step 4: Simplify right side
    1,387.84x = 1,366,367.21
  5. Step 5: Solve for x
    x = 1,366,367.21/1,387.84
  6. Step 6: Final answer
    x = 984.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.